:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #121212;
    --bg-tertiary: #1a1a1a;
    --bg-elevated: #242424;
    --bg-card: #181818;
    
    --text-primary: #ffffff;
    --text-secondary: #a7a7a7;
    --text-tertiary: #6a6a6a;
    
    --accent-primary: #1db954;
    --accent-hover: #1ed760;
    --accent-pressed: #169c46;
    
    --gradient-start: #450af5;
    --gradient-end: #c4efd9;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 50%;
    
    --transition-fast: 0.1s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;
    
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 14px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
}

.app-container {
    display: flex;
    height: calc(100vh - 90px);
}

/* Sidebar */
.sidebar {
    width: 240px;
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.nav-section h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    margin: 0 calc(-1 * var(--spacing-md));
}

.nav-item:hover {
    color: var(--text-primary);
    background: var(--bg-elevated);
}

.nav-item.active {
    color: var(--text-primary);
    background: var(--bg-elevated);
}

.nav-item svg {
    width: 24px;
    height: 24px;
}

.playlist-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    font-size: 12px;
}

.playlist-icon.liked {
    background: linear-gradient(135deg, #450af5, #c4efd9);
}

/* Main Content */
.main-content {
    flex: 1;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(10px);
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-elevated);
    border-radius: var(--radius-full);
    padding: var(--spacing-sm) var(--spacing-md);
    width: 360px;
    gap: var(--spacing-sm);
    transition: all var(--transition-fast);
}

.search-box:focus-within {
    background: var(--bg-primary);
    box-shadow: 0 0 0 2px var(--text-primary);
}

.search-box svg {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
}

.search-box input {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 0.875rem;
    outline: none;
    width: 100%;
}

.search-box input::placeholder {
    color: var(--text-secondary);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.btn-upgrade {
    background: transparent;
    border: 1px solid var(--text-secondary);
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-upgrade:hover {
    border-color: var(--text-primary);
    transform: scale(1.02);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    overflow: hidden;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.user-avatar:hover {
    transform: scale(1.1);
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.content-scroll {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
}

.content-scroll::-webkit-scrollbar {
    width: 12px;
}

.content-scroll::-webkit-scrollbar-track {
    background: transparent;
}

.content-scroll::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.3);
    border-radius: 6px;
}

/* Hero Section */
.hero {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, rgba(69,10,245,0.8) 0%, rgba(18,18,18,0.8) 100%);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    position: relative;
    overflow: hidden;
    min-height: 300px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: url('https://images.unsplash.com/photo-1614613535308-eb5fbd3d2c17?w=800&fit=crop') center/cover;
    opacity: 0.3;
    filter: blur(20px);
}

.hero-content {
    position: relative;
    z-index: 1;
    flex: 1;
}

.badge {
    display: inline-block;
    background: rgba(255,255,255,0.2);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
}

.hero h1 {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.hero .artist {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.hero .description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 400px;
    line-height: 1.5;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.btn-play {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--accent-primary);
    color: var(--bg-primary);
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.btn-play:hover {
    background: var(--accent-hover);
    transform: scale(1.04);
    box-shadow: var(--shadow-lg);
}

.btn-play svg {
    width: 24px;
    height: 24px;
}

.btn-secondary {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: transparent;
    border: 1px solid var(--text-secondary);
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-secondary:hover {
    border-color: var(--text-primary);
    background: rgba(255,255,255,0.1);
}

.btn-secondary svg {
    width: 20px;
    height: 20px;
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.1);
}

.btn-icon svg {
    width: 24px;
    height: 24px;
}

.hero-image {
    position: relative;
    z-index: 1;
    width: 232px;
    height: 232px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-slow);
}

.hero-image:hover {
    transform: scale(1.02) rotate(2deg);
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Sections */
.section {
    margin-bottom: var(--spacing-xl);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
}

.see-all {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.see-all:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

/* Card Grid */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--spacing-lg);
}

.music-card {
    background: var(--bg-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.music-card:hover {
    background: var(--bg-elevated);
    transform: translateY(-4px);
}

.music-card:hover .play-overlay {
    opacity: 1;
    transform: translateY(0);
}

.card-image {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.music-card:hover .card-image img {
    transform: scale(1.05);
}

.play-overlay {
    position: absolute;
    bottom: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 48px;
    height: 48px;
    background: var(--accent-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateY(8px);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.play-overlay:hover {
    background: var(--accent-hover);
    transform: scale(1.1) translateY(0);
}

.play-overlay svg {
    width: 24px;
    height: 24px;
    color: var(--bg-primary);
    margin-left: 2px;
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-artist {
    font-size: 0.875rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Player Bar */
.player-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 90px;
    background: var(--bg-secondary);
    border-top: 1px solid rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    z-index: 100;
}

.player-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex: 1;
}

.player-section.controls {
    flex: 2;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-width: 722px;
}

.player-section.extra-controls {
    justify-content: flex-end;
}

.track-info {
    min-width: 180px;
}

.track-thumb {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    box-shadow: var(--shadow-sm);
}

.track-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.track-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.track-artist {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.btn-like {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
    margin-left: var(--spacing-sm);
    transition: all var(--transition-fast);
}

.btn-like:hover {
    color: var(--accent-primary);
    transform: scale(1.1);
}

.btn-like.active {
    color: var(--accent-primary);
}

.btn-like svg {
    width: 20px;
    height: 20px;
}

/* Controls */
.control-buttons {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.control-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.control-btn:hover {
    color: var(--text-primary);
    transform: scale(1.1);
}

.control-btn svg {
    width: 20px;
    height: 20px;
}

.control-btn.play-pause {
    width: 40px;
    height: 40px;
    background: var(--text-primary);
    color: var(--bg-primary);
    border-radius: var(--radius-full);
}

.control-btn.play-pause:hover {
    transform: scale(1.05);
    background: var(--text-primary);
}

.control-btn.play-pause svg {
    width: 16px;
    height: 16px;
}

.hidden {
    display: none !important;
}

/* Progress Bar */
.progress-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
}

.time {
    font-size: 0.6875rem;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
    min-width: 35px;
}

.progress-bar {
    flex: 1;
    height: 4px;
    background: rgba(255,255,255,0.3);
    border-radius: var(--radius-full);
    position: relative;
    cursor: pointer;
    overflow: visible;
}

.progress-fill {
    height: 100%;
    background: var(--text-primary);
    border-radius: var(--radius-full);
    position: relative;
    transition: width 0.1s linear;
}

.progress-handle {
    position: absolute;
    top: 50%;
    width: 12px;
    height: 12px;
    background: var(--text-primary);
    border-radius: var(--radius-full);
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.progress-bar:hover .progress-handle {
    opacity: 1;
}

.progress-bar:hover .progress-fill {
    background: var(--accent-primary);
}

/* Volume */
.volume-control {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 136px;
}

.volume-slider {
    flex: 1;
    height: 4px;
    background: rgba(255,255,255,0.3);
    border-radius: var(--radius-full);
    cursor: pointer;
    position: relative;
}

.volume-fill {
    height: 100%;
    background: var(--text-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-fast);
}

.volume-slider:hover .volume-fill {
    background: var(--accent-primary);
}

/* Responsive */
@media (max-width: 1024px) {
    .sidebar {
        width: 72px;
        padding: var(--spacing-md);
    }
    
    .logo span,
    .nav-section h3,
    .nav-item span {
        display: none;
    }
    
    .nav-item {
        justify-content: center;
        padding: var(--spacing-md);
        margin: 0;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-image {
        width: 192px;
        height: 192px;
    }
}

@media (max-width: 768px) {
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .hero-image {
        width: 100%;
        max-width: 300px;
        height: auto;
        aspect-ratio: 1;
    }
    
    .player-section.extra-controls {
        display: none;
    }
    
    .track-info {
        min-width: auto;
    }
}

/* Animations */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.playing .track-thumb {
    animation: pulse 2s infinite;
}

/* Glassmorphism effects */
.glass {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Custom selection */
::selection {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

/* Add these styles to the end of your existing styles.css */

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.loading-overlay.hidden {
    display: none;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Buffering indicator on progress bar */
.progress-bar.buffering::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(29, 185, 84, 0.3), transparent);
    animation: buffering 1.5s infinite;
}

@keyframes buffering {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Active states for controls */
.control-btn.active {
    color: var(--accent-primary) !important;
    position: relative;
}

.control-btn.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    background: var(--accent-primary);
    border-radius: 50%;
}

/* Volume muted state */
.volume-control.muted .volume-fill {
    background: var(--text-tertiary);
}

/* Error message toast */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-elevated);
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transition: all var(--transition-normal);
    z-index: 1001;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border-left: 4px solid #e22134;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast svg {
    width: 20px;
    height: 20px;
    color: #e22134;
}

/* Playing animation on thumbnail */
.track-thumb.playing {
    animation: pulse 2s infinite;
    box-shadow: 0 0 20px rgba(29, 185, 84, 0.4);
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

/* Disabled state */
.control-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Seeking cursor */
.progress-bar.seeking {
    cursor: grabbing;
}

/* Audio visualizer bars (decorative) */
.visualizer {
    display: flex;
    align-items: flex-end;
    gap: 3px;
    height: 20px;
    margin-left: var(--spacing-sm);
}

.visualizer-bar {
    width: 3px;
    background: var(--accent-primary);
    border-radius: 2px;
    animation: visualizer 0.5s ease-in-out infinite alternate;
}

.visualizer-bar:nth-child(1) { height: 30%; animation-delay: 0s; }
.visualizer-bar:nth-child(2) { height: 60%; animation-delay: 0.1s; }
.visualizer-bar:nth-child(3) { height: 40%; animation-delay: 0.2s; }
.visualizer-bar:nth-child(4) { height: 80%; animation-delay: 0.3s; }

@keyframes visualizer {
    from { transform: scaleY(0.5); }
    to { transform: scaleY(1); }
}

.hidden {
    display: none !important;
}